I have looked and cannot understand. I do know that the said transistor vr2 is reading 7.5v on the output pin. Is this transistor faulty?? I have checked output on ac and readings were on vr1 /vr2 output pins and they are both reading 0.4mv ac???
Thanks

Im not sure about this but if the voltage regulator (vr2) is showing 7.5v on the output pin well isnt something else at fault thats why it giving that voltage??
Im not sure at all if this is correct but what other components could be making the voltage drop?

Check what voltage is actually powering the amp. Put black probe on black speaker output socket and red probe on the end of D5 with the white line, note the voltage reading. Now move the red probe to the end of D7 opposite the white line, note the voltage reading.

hi richie,
yes i have done this and they are both reading 39v and same on the other channel.
I have also checked
d17 d18 they are reading 1.1 m ohms, and rising slowley
d19 d20 they are reading 450.k ohms, and rising quite fast
these are the same should these not read the same..

Another check that you can do with the amplifier tuner off is to read the resistance of the Vr2 + and the Vr1- to ground. Both resistance should read close. Ii you have a low resistance in the VR2+ means something it is loading it. If both are close then you may have a bad voltage regulator.